Engine-indicator.



PATENTED OCT. 15, 1907.

F. L. WOLPE.

ENGINE. INDICATOR.

APPLIoATIox funn ulm, 190e.

2 SHEETS-SHEET l.

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No. 868.056. PATENTED OCT. 15, 1907. F. L. WOLPB.

ENGINE INDICATOR..

Arrmouxox Hmm ulm, 190s.

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.UNITED sTATEs PATENT oEEroE` FRANK L. WOLFE, OF MED FORD,MASSACHUSETTS, ASSIGNOR TO CROSBY STEAM GAGE .AND

VALVE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

ENGINE-INDICATOR.

Specicatiori of Letters Patent.

Patented Oct. 15, 1907.

Application filed January 2,1906. Serial No. 294,333.

4To all whom it ymay concern.'

Be it known that l, FRANK L. WOLFE, a citizen of the United States, anda resident of Medford, in the county of Middlesex and State oiMassachusetts, have invented certain new and useful Improvements inEngine-Indicators, ot' which the following is a specification.

My invention relates to engine indicators and its object is to provide adrum furnished with a paper strip E on which a series of diagrams may betaken without removing such strip from the drum.

1t is illustrated by the accompanying drawings in which:

Figure 1 is an elevation of the drum with a portion ot' the indicator.Fig. 2 is a central vertical section oi the drum. Fig. 3 is a top viewof the drum. Fig. 4 is a section on the line 4-4 Fig. 2. Fig. 5 is adetailed view of the guard, Fig. 6 is an enlarged section on the line6-6, Fig. l.. Fig. 7 is an enlarged view oi a portion of therecord-strip with diagrams thereon.

Similar characters refer to similar parts throughout the severaldrawings.

l is the indicator on which is mounted the pencil 2 movable towards andaway from the drum 3, being manipulated by the knob 4. On the arm 5,fixed to the indicator, is mounted the fixed spindle (i and on thisspindle is mounted the rotary spring actuated drum 3 with a central opening at the top and a vertical opening as shown. The spring 7 is fixedat its lower end to the springhead 8 on said drum and at its upper endto the springhead 9 on said spindle.

The cylindrical guard 11, having a cut ont portion 1() is fixed to theupper part oi the drum adjacent to the central opening thereoi, andconcentric therewith, and is adapted to protect the paper rollhereinafter nientione'd.

On the upper end of the spindle 6 is fixed the cylindrical hub l2.having a vertical slot 1.3 in which is pivoted the vertical retainingpawl 14. In this hub 12 is arranged the rotary cam 15 with its outer endknurled for manipulation and its inner' end furnished with an annulargroove lti dividing it into two parts, the upper part having a fiattenedportion 17 constituting the cam proper. Fixed to this cani and extendinginto said annular groove are two studs 1.8 adapted to contact with thescrew 19 engaging said hub and extending into said groove.. This screw19 prevents vertical movement of the said cam 15 and together' with saidstuds 18 limits its rotatability. The reel 20 with vertical slot 201land knurled head 20b is rotatably mounted upon the drum and depends iromthe opening therein. This knurled head 20" is fixed to the reel 20 inany way, for instance riveted thereto, forming a part thereof andproviding a convenient means for handling said reel. Upon the upper endof said reel is fixed the double annular ratchet 2l having outer' teeth22 and inner' teeth 23.

Fixed to the top oi the drum 3 is the driving pawl 24 adapted to engagethe outer teeth 22 oi the ratchet and held against said ratchet by thespring 25. When this pawl is out oi engagement with the teeth, it isheld out oi such engagement by the end of said spring 25, which engagesthe end oi said pawl. The vertical pawl 14 pivoted in hub 12, asdescribed. has its lower end in engagement with the spring 26 fixed tothe hub 12 and such spring serves to thrust and hold said lower endoutwardly and the upper end of said pawl inwardly. When its upper end isin engagement with the flat por'- tion 1.7 of the cam, its lower endengages and prevents said ratchet from rotating in the direction shownby the arrow 27 but permits it to rotate in the direction shown by thearrow 2S. This engagement of the pawl with the inner teeth oi theratchet is broken by rotating the cam, thereby bringing the upper end ofsaid pawl into contact with the cylindrical portion of the cani. It isobvious that the two pawls when in engagement with the ratchet teeth, asdescribed, permit said ratchet to rotate in the direction indicated bythe arrow 2S but prevent its rotation in the opposite direction.

The guide rolls 29, 30, 31, fixed to the drum at its vertical opening,serve to guide the paper strip 36 which may be of any length and which,in the orin of a roll, is mounted on the fixed spindle 32 arrangedwithin said cylinder, as shown. The outer end oi this roll is carriedbetween the guide rolls 30 and 31, thence around the drum and over theguide roll 29, thence between the guard 11 and the reel 20 and aroundsaid reel, its outer edge being inserted in the vertical slot 201L inreel.

The vertically adjustable spring 33, carrying upon its upper end thepencil 34, is employed to mark upon the card what is known as theatmospheric line.7

The cord 35 fixed to the drum and carried between the horizontally adjust-able pulleys 35Il leads to the engine (not shown).

' The operation of the device is as ollowsz-The paper strip 36, in theform of a roll, being mounted upon the spindle 32, drum 3 and reel 20,as described, and the pawls 14 and 24 engaging the teeth of the ratchet,as described, the cord 35 when drawn outwardly rotates the drum in thedirection shown by the arrow 27, while the reel 2O remains stationaryheld by the retaining pawl 14, which, as before stated, is pivotcd inthe vertical slot in the cylindrical hub 12, the drum sliding under thepaper strip, The outward pull upon the cord 34 ceasing and said cordrelaxing, the drum is rotated in the opposite direction by the spring 7,and the reel 2O rotates therewith driven by the pawl 24. This opera tionpresents successively new sections o the paper' strip to the pencil,which describes successive diagrams thereon. And so the operation isrepeated and eventually the paper strip with the series of diagramsthereon is wound upon the reel 20, and this reel is removed from Withinthe cylinder through the top thereof by means of the knurled top 20bWithout removing the drum from its mounting, and this is an importantfeature of my invention.

It is perfectly obvious that, if the pawl 14 is held out oi engagementwith the teeth 23 and the pawl 24 remain in engagement with the teeth22, the reel and drum rotate together as though constituting'one piece.And it is equally obvious that as desired for any purpose either pawl orboth pawls may be thrown in or out of engagement at will.

Having described my invention, what I claim and desire to secure byLetters Patent is:

1. In an engine indicator the combination, with the drum suitablymounted, of a spindle mounted in said drum and adapted to hold a roll ofpaper, a Winding reel mounted in said drum concentrically therewith andremovable through anopening in the top thereof, and automatic means forwinding such paper 01T said spindle onto said reel consisting of aratchet fixed to said reel, a driving pawl carried by said drum and aretaining pawl suitably mounted; substantially'as described.

2. In an engine indicator' the combination, with the drum suitablymounted, ot a winding reel adapted to have wound upon it a paper strip,said reel being mounted in said drum concentrically therewith andremovable through an opening in the top thereof, with automatic meansfor winding such paper strip onto said reel consisting of a ratchetfixed to said reel, a driving pawl carried by said drum and a retainingpawl suitably mounted; substantially as described.

3. In an engine indicator Athe combination, with a drum suitablymounted, of a winding reel adapted to have wound upon it a paper strip,said reel being mounted in said drum concentrically therewith', withautomatic means l'or winding such paper strip onto said reelconsisting.y of n ratchet fixed to said reel, a driving pawl carried bysaid drum and a retaining pawl suitably mounted; substantially asdescribed. v

In testimony whereof l have aflixed my signature, in presence of twowitnesses.

FRANK L. \VLFE.

Witnesses IDA F. WOLFE, RALPH W. FOSTER.

